CVE-2026-43233 (GCVE-0-2026-43233)
Vulnerability from cvelistv5
Published
2026-05-06 11:28
Modified
2026-10-19 19:16
Severity ?
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_h323: fix OOB read in decode_choice() In decode_choice(), the boundary check before get_len() uses the variable `len`, which is still 0 from its initialization at the top of the function: unsigned int type, ext, len = 0; ... if (ext || (son->attr & OPEN)) { BYTE_ALIGN(bs); if (nf_h323_error_boundary(bs, len, 0)) /* len is 0 here */ return H323_ERROR_BOUND; len = get_len(bs); /* OOB read */ When the bitstream is exactly consumed (bs->cur == bs->end), the check nf_h323_error_boundary(bs, 0, 0) evaluates to (bs->cur + 0 > bs->end), which is false. The subsequent get_len() call then dereferences *bs->cur++, reading 1 byte past the end of the buffer. If that byte has bit 7 set, get_len() reads a second byte as well. This can be triggered remotely by sending a crafted Q.931 SETUP message with a User-User Information Element containing exactly 2 bytes of PER-encoded data ({0x08, 0x00}) to port 1720 through a firewall with the nf_conntrack_h323 helper active. The decoder fully consumes the PER buffer before reaching this code path, resulting in a 1-2 byte heap-buffer-overflow read confirmed by AddressSanitizer. Fix this by checking for 2 bytes (the maximum that get_len() may read) instead of the uninitialized `len`. This matches the pattern used at every other get_len() call site in the same file, where the caller checks for 2 bytes of available data before calling get_len().
References
Impacted products
Vendor Product Version
Linux Linux Version: ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa
Version: ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa
Version: ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa
Version: ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa
Version: ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa
Version: ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa
Version: ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa
Version: ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa
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(bs-\u003ecur + 0 \u003e bs-\u003eend),\\nwhich is false.  The subsequent get_len() call then dereferences\\n*bs-\u003ecur++, reading 1 byte past the end of the buffer.  If that byte\\nhas bit 7 set, get_len() reads a second byte as well.\\n\\nThis can be triggered remotely by sending a crafted Q.931 SETUP message\\nwith a User-User Information Element containing exactly 2 bytes of\\nPER-encoded data ({0x08, 0x00}) to port 1720 through a firewall with\\nthe nf_conntrack_h323 helper active.  The decoder fully consumes the\\nPER buffer before reaching this code path, resulting in a 1-2 byte\\nheap-buffer-overflow read confirmed by AddressSanitizer.\\n\\nFix this by checking for 2 bytes (the maximum that get_len() may read)\\ninstead of the uninitialized `len`.  This matches the pattern used at\\nevery other get_len() call site in the same file, where the caller\\nchecks for 2 bytes of available data before calling get_len().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.252\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.202\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.165\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.128\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.75\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.16\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.6\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"4.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:26:46.159Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-43233\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T19:16:24.877Z\", \"dateReserved\": \"2026-05-01T14:12:55.995Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-05-06T11:28:29.565Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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